Sink-strainer seat pressing tool



Dec. 10, 1957 B. POSKA SINK-STRAINER SEAT PRESSING T001.

Filed May 11, 1954 Bert Po slra I N V EN TOR. 21..., man BY My Unite The present invention relates to sheet metal clamping, bending, and forming tools and implements, generally stated, and has more particular reference to a manually usable pressure tool through the medium of which a truncated conical seat may be handily formed in an apertured sheet of metal such as is used, for example, in constructing the bottom of a sheet metal sink, and wherein the thus formed seat serves to aptly position and accommodate a correspondingly shaped sink strainer.

There has long existed a recognized need for a handy tool capable of enabling a user to quickly accomplish the desired bending and seat forming step, a tool which is such in construction that it enables the user to do what has to be done almost without conscious effort. Therefore, it is an object of the instant matter to provide a simple, practical, economical and easy-to'use hand tool which will meet with the requirements of manufacturers and will enable the average user, virtually unacquainted with the techniques of forming and bending sheet metal, to successfully master the procedure necessary and to, at the same time, be sure that the seat which he perfects is appropriate and will accommodate the strainer with requisite nicety.

In carrying out a preferred embodiment of the invention, a construction is provided which is characterized by a female die member, a complemental male die member and a bolt having a screw threaded shank passing through bolt holes in the members when the latter are in superposed relationship, the bolt having a head on the lower end and a nut on the upper screw threaded end for cooperation with the coacting surface of the adjacent female die member. More specifically, novelty is predicated upon the stated female die member which is in the form of a solid block having an axially centered bolt hole, a flat bottom, a marginally flat top and a conical recess provided in the top portion of the block and communicating with said bolt hole, said female die member also comprising a block having a flat top, a truncated conical bottom conformably telescoping and seated in said recess, and an axially centered bolt hole registering with said first named bolt hole, said bolt having its head abutting the flat bottom of the female die member and its shank passing upwardly through both of said bolt holes, said nut resting atop the fiat top of said female die member.

rates Patent f Stated somewhat more explicitly, the invention also more readily apparent from the following description and the accompanying sheet of illustrative drawings.

In the drawings, wherein like numerals are employed to designate like parts throughout the views:

Figure 1 is a perspective view of the female die member by itself;

Figure 2 is a perspective view of the male die member;

Figure 3 is a view in section and elevation showing the manner in which the die members are bolted together and with the apertured sheet metal interposed between the members in readiness for bending and forming; and

Figure 4 is a view based on Figure 3 and showing the completed seat forming step.

It will be an aid for the reader to understand, generally speaking, how a seat for a sink strainer in a metal sink is now constructed. The process requires two workmen. First, a hole is punched out of the bottom of the sink where the strainer is to go, and then one man has to go underneath the sink and hold a cup-shaped instrument of the right size under the hole; and the other workman must then peen the metal down into the cupshaped depression to make the seat. This usually takes from 45 minutes to an hour and, of course, the size of the seat when completed will vary and there will be some roughness and irregularity of the surface due to the fact that the seat is made by repeated hammer blows.

Referring now to the drawings with the aid of reference numerals and accompanying lead lines, the female die member is in the form of a solid substantially rectangular (either square or oblong) metal block and it is denoted by the numeral 6. The marginal surfaces are flat and the bottom is likewise fiat as is shown at 8 in Figures 3 and 4. The outer marginal portion of the top is likewise flat as at 10 and defines an endless foundation or anvil for the cooperating portion 12 of the bendable sheet metal 14. A gradually tapering conical cavity or recess 16 is formed from the top downwardly in the body portion of the block and its larger diameter, denoted by the line 18 is spaced inwardly from the inner marginal edge of the anvil surface 10. There is an axial bolt hole 2t) provided and this extends through the center portion of the block and between the bolt hole and the lower restricted portion of the recess there is a counter-recess which may be described as a circular pocket and'which is at the junctural point between the recess 16 and the bolt hole 20. This pocket has a bottom 22 and an encircling vertical wall 24. The collar-like male die member is denoted by the numeral 26 and here again this is in the form of a solid metal block. The top is smooth and flat as at 28. The upper half portion, or body 30, is cylindrical in cross-section. The lower half portion tapers and provides a metal bending cone 32. It will be noted that the outside diameter of this block is less than the outside diameter of the recess and therefore the block telescopes into the recess in the manner shown in Figure 4. This block has a centered bolt hole 34 aligned with the bolt hole 20 and at the bottom thereof there is a cylindrical extension 36 which is a guide neck which concentrically surrounds the bolt and which has a diameter corresponding to the diameter of the punched hole or aperture 38 in the sheet metal. This neck is telescoped into the hole and keys the male block to the metal so that the metal follows down into the recess under thrust action in proper prescribed alignment.

The aforementioned bolt is denoted by the numeral 40 and it has a flat faced tool gripping head 42 which rests against the fiat bottom 8 and includes a shank 44 which extends upwardly through the respective bolt holes and has an upper screw threaded end portion 46 to accom modate the readily attachable and detachable assembling Patented Dec. 10, 1957.

and binding nut 48, which nut, as is clear, bears with requisite thrust action against the surfaee'or top 28.

Considering the fact that the over-all tool is characterized by two die blocks 6 and 26 with bolt holes and an accompanying bolt for the nut, it will be'seen that'the' over-all structure is the utmost in simplicity of construction and use. 7 I

Briefly recapitulated, the tool herein revealed is expressly designed for quick accomplishment of the task at hand. It is structurally implemented that it is aptly intended to, and does, enable the user to do what has to be done, almost without conscious effort. Any average workman, virtually unacquainted with the techniques of the forming and bending art, can successfully master the procedure necessary and can be sure that the seat which he perfects is precisely that which will be required to accommodate the subsequently applied strainer. To this end, the female die member or block slips over the threaded upper end of the bolt after the latter has been passed upwardly through the hole in the sheet of metal and the guide neck pilots itself into the hole, thus keying the parts together in their intended non-slipping relationship. The endless flat anvil surface provides and affords the proper formation for the sheet metal as depicted in Figure 3 and when the nut is tightened against the female block the latter centers the bendable area of the sheet and misalignment and displacement of cooperating parts is avoided, all with requisite nicety. And, as is clear from Figure 4 the clamping, bending and shaping result is brought about with the desired degree of certainty and uniformity. The head of the'bolt may be held against movement and rotation in a vise or with an applied wrench (not shown) and the nut may be driven home, as is obvious, with a second wrench, pliers, or the like.

From the foregoing, the construction and operation of the device will be readily understood and further explanation is believed to be unnecessary. However, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the appended claim.

What is claimed as new is as follows:

A simple three-part sink strainer seating tool comprising, in combination, a first block rectangular in shape and having a fiat bottom, an axially centered bolt hole opening through said bottom, a marginal flat top portion providing an anvil surface, a concentric conical recess formed in said block with its larger upper end portion opening through the top of the block and circumscribed by said fiat anvil surface, a circular counter-recess defining a pocket intervening between the lower end portion of the conical recess and said bolt hole, a second block smaller than said first block and embodying a cylindrical flat-top upper half-portion of an outside diameter less than the outside diameter of said conicalrecess, and a lower half-portion conically shaped to conformingly cooperate with said conical recess, the apical portion of the lower half-portion having a cylindrical extension providing a guide neck, the latter of an outside diameter to telescope snugly into said pocket, an

axially centered bolt hole passing through said second References Cited in the file of this patent UNITED STATES PATENTS 1,266,293 McCoy May 14, 1918 2,288,378 Veit June 30, 1942 2,292,446 Huck Aug. 11, 1942 2,413,518 Rechton et al Dec. 31, 1946 2,423,957 Amtsberg July 15, 1947' 

